Figure 43. 



9b Not as in 9a 



HOW TO KNOW THE INSECTS 



Fig. 43. Llninephllus rhomb Icus L. 



Pale tan, front viilngs mottled with 

 darker tan. Length about 15 mm. 



These Interesting Insects are 

 named and known best for their young. 

 The larvae live In streams and build 

 cases of v/eb and little stones, twigs 

 or debris, for their protection. 

 They are so abundant that after the 

 fish have eaten a large percentage 

 of them, the adults developing from 

 the remaining larvae become an In- 

 tolerable nuisance at lights near 

 water courses. Fishermen should be 

 much Interested In knowing more 

 about these and our other aquatic 

 Insects, If fish culture Is to be 

 wholly successful. 



10 



10a Wings vNith but few cross veins (or none) as in the bees. 

 Fig. 44 11 



Fig. 44. Iv-egachlle mendlca Cress. 



Black thorax and rings on abdomen 

 covered with pale yellowish white hairs, 

 Cuts circular pieces from leaves and 

 petals of rose and other plants with 

 which to line its nest. Length 12-14 

 mm. 



(Family 61, Megachllldae) 



Figure 44, 



10b Wings with several to many cross (vertical) veins, as In 

 the dragon flies, lace wings, etc. Fig. 45 



12 



Fig. 45. Plathemls lydla Drury 



Brown; two yellow stripes on each 

 side of thorax and a yellow spot 

 on each side of abdominal segments, 

 2-9. Length 40-44 mm. Expanse of 

 wings 68-72 mm. 



Figure 45, 



11a Front wings the larger; hind wings frequently hooked to 

 front wings. Mouthparts for chewing or for chewing and suck- 

 ing. (Bees, wasps, ants) Figs. 46 and 226 to 245, 



Order XXV, HYMENOPTERA p. 106 



41 



